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Human Nature

, Volume 23, Issue 3, pp 341–359 | Cite as

Conditional Grandmother Effects on Age at Marriage, Age at First Birth, and Completed Fertility of Daughters and Daughters-in-law in Historical Krummhörn

  • Johannes Johow
  • Eckart VolandEmail author
Article

Abstract

Based on historical data pertaining to the Krummhörn population (eighteenth and nineteenth centuries, Germany), we compared reproductive histories of mothers according to whether the maternal grandmother (MGM) or the paternal grandmother (PGM) or neither of them was resident in the parents’ parish at the time of the mother’s first birth. In contrast to effects of PGMs, we discovered conditional differences in the MGM’s effects between landless people and wealthier, commercial farmers. Our data indicate that the presence of the MGM only lowers the woman’s age at marriage (AAM) and her age at the birth of her first child (AFB) in the case of landless families. However, among commercial farmers, who can generally be characterized by a lower AAM and AFB, we found opposite tendencies for the MGM’s effect leading to a relatively small delay in AAM and AFB. Moreover, we also analyzed differences in the completed fertility (i.e., children ever born: CEB). Results indicate that landless families in general do have fewer CEB compared with commercial farmers except for those families in which the MGM has been present. Emphasizing that the adaptiveness of investment decisions should depend on the interaction of genetic, lineage-specific (intrinsic) and ecologically imposed (extrinsic) constraints, we conclude that kin strategies consequently address different fitness components under different conditions.

Keywords

Age at marriage Age at first birth Female fertility Grandmothers In-law conflict Krummhörn 

Notes

Acknowledgments

We would like to thank Isabelle Cobres for inspiring discussion. In addition, we are thankful to two anonymous reviewers for providing valuable help during earlier stages of the manuscript. Financial support came from Deutsche Forschungsgemeinschaft (DFG) and from a personal grant to JJ from the University of Giessen.

Supplementary material

12110_2012_9147_MOESM1_ESM.pdf (205 kb)
ESM 1 (PDF 204 kb)

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Copyright information

© Springer Science + Business Media, LLC 2012

Authors and Affiliations

  1. 1.Zentrum für Philosophie und Grundlagen der Wissenschaft Universität GiessenGiessenGermany

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